OSPF routing troubleshooting

[thiyagarajankalaiselvan]

Hi All,

I'm facing a strange issue in OSPF router advertisement. If we advertise a specific IP in OSPF and that is causing packet drop issue for all the subnets in the switch.

Can you throw few troubleshooting steps in OSPF to identify the issue?

Regards,

Thiyagu               

[Muhammad Thanveer]

Hello,

what kind of traffic is sent from the subnet and destined to it.

Check if the bandwidth is getting chowk because of it.

Also have a look at the subnet if any overlapping is there..

Please rate the helpful posts..

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

[paul driver]

Hello
Are you summarising anywhere?

Can you post some config:
Sh ip protocols
Sh run | sec router
Sh ip int brief
Sh ip ospf

Res
paul


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[thiyagarajankalaiselvan]

Thanks All... I would like to know command to find uptime of a OSPF route in OSPF database and when was the last OSPF re-convergence time for a specific area.

Regards,

Thiyagu

[blau grana]

Show when was SPF algh. last time executed.
show ip ospf topology-info

http://www.cisco.com/en/US/docs/ios/mtr/command/reference/mtr_02.html#wp1165403

Show SPF calculation statistics

show ip ospf statistics [detail]

http://www.cisco.com/en/US/docs/ios/iproute_ospf/command/reference/iro_osp3.html#wp1014222

Best Regards

Please rate all helpful posts and close solved questions

[Muhammad Thanveer]

Hello,

Please find the command as

sh ip ospf rib a.b.c.d

sh ip ospf rib a.b.c.d

            OSPF Router with ID (x.y.v.c) (Process ID 9)

                Base Topology (MTID 0)

OSPF local RIB
Codes: * - Best, > - Installed in global RIB

*>  9.9.t..l/32, Intra, cost 2, area 0
     SPF Instance 32, age 00:00:12
     Flags: RIB, HiPrio
      via 9.9.23.3, GigabitEthernet0/0.23, flags: RIB
       LSA: 1/9.9.y.z3/9.9.x.x

[paul driver]

Hello,

The easiest way - sh ip route x.x.x.| in Last

To  ensure the ospf database is uptodate and LSA's are identical in every router - ospf uses flooding  as way to handle a changes to this database- 

http://ospf.cs.st-andrews.ac.uk/index.shtml?floods&040000

res

Paul